(c) Notices. All notices required under the terms and provisions hereof shall be in writing, shall be sent to Lessor or Lessee at their respective addresses or facsimile numbers set forth in Exhibit C hereto (or such other addresses or facsimile numbers as the parties may designate from time to time by notice pursuant to this Section 20(c)) by telefax and by air courier. Any such notice shall become effective upon the earlier of actual receipt or the fifth (5th) day following the date such notice is sent by air courier.



 (d) Lessor's Right to Perform for Lessee. If Lessee fails to make any payment of Supplemental Rent required to be made by it hereunder or fails to perform or comply with any covenant, agreement or obligation contained herein, Lessor shall have the right but not the obligation to make such payment or conform or comply with such agreement, covenant or obligation, and the amount of such payment and the amount of the reasonable expenses of Lessor incurred in connection with such payment or the performance thereof or compliance therewith, together with interest thereon at the Interest Rate, shall be payable by Lessee to Lessor (as Supplemental Rent) upon demand. Lessor agrees to notify Lessee in writing prior to making any payment under this Section 20(d), unless the Aircraft will be in danger of loss, sale, confiscation, forfeiture or seizure should such payment not be made. The taking of any such action by Lessor pursuant to this Subsection 20(d) shall not constitute a waiver or release of any obligation of Lessee under the Lease, nor a waiver of any Event of Default which may arise out of Lessee's nonperformance of such obligation, nor an election or waiver by Lessor of any remedy or right available to Lessor under or in relation to this Lease.